AJ Styles explained why he didn't wear a cup in his storyline with Shinsuke Nakamura during an interview with WrestleZone.com:

“Well you know, even when I played baseball when I was younger I didn’t like wearing a cup because it got in the way of getting up and you know, it was just in the way. If I wore it now and I did a splash and missed, how would that feel? It would hurt. You know there are things that can happen in a match where this whole cup thing can actually hurt me. Just saying and I know I don’t need to be having any more kids anyway.”